He is a boy that Luna finds wounded in the forest. His body shrinks after the removal of a curse.

The magic fantasy manga centers on Luna, a witch who lives in the black forest, and is feared by others. She is called the Champignon Witch because anywhere she walks, talks, and touches ends up growing poisonous mushrooms. The story follows the first love of this woman who has previously not known the warmth of another person.
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(Source: Anime News Network)

Luna, a black witch who lives quietly in a poisonous mushroom house, deep in the Black Forest. She lives in the city making high-efficiency medicines, but she is rumored to be rumored to die if she is touched, and she is avoided ... The life of a witch who doesn't know the warmth of people is carefully and momentarily drawn.

Lisl